Overview
The Bussmann Fusetron FRS-R-15 is a dual-element, time-delay fuse manufactured by Eaton’s Bussmann series for industrial circuit protection. This Class RK5 fuse is rated 15A at 600VAC and 300VDC, with ferrule terminal connections and a 0.81-inch diameter body measuring 5 inches in overall length. The FRS-R-15 combines overload and short-circuit protection in a single component, making it ideal for motor circuits and branch-circuit applications subject to temporary inrush currents.
Key Features
- Dual-Element Design: Separate overload and short-circuit protection elements
- Time-Delay Response: 10-second minimum hold time at five times the ampere rating, preventing nuisance blows from motor inrush
- Current-Limiting: 200 kA interrupting capacity at 600V, with class RK5 rating providing selective coordination
- Non-Indicating: No blown fuse indicator; visual inspection required
- Ferrule Terminals: Standard ferrule-end connections for holder mounting
- UL and CSA Certified: Meets UL standard 248-12 Class RK5 and CSA C22.2 No. 248.12
Technical Specifications
- Current Rating: 15A
- Voltage Rating: 600VAC / 300VDC
- Class: RK5
- Type: Dual-element, time-delay
- Interrupting Capacity: 200 kA @ 600V AC, 20 kA @ 300V DC
- Response Time: 10 seconds @ 500% current
- Body Diameter: 0.81 inches (20.6 mm)
- Body Length: 5 inches (127 mm)
- Weight: 0.17 lb
- Terminal Type: Ferrule
- Rejection/Non-Rejection: Rejection (Class R only)
Typical Applications
The FRS-R-15 is widely used in:
- Three-phase motor branch-circuit protection
- Industrial control circuits with temporary overload conditions
- Equipment requiring coordination with downstream Class RK1 fuses
- Standard industrial fuse blocks and holders rated for Class R or RK5
- OEM equipment and panel assemblies rated 600V
Compatibility & Replacements
Compatible With
- Standard Class R and Class RK5 fuse blocks and holders
- 600V AC industrial control circuits and motor starter combinations
- Eaton Bussmann series fuse blocks and rejection-style holders
- Any circuit requiring 15A, 600V Class RK5 time-delay protection
Replaces / Drop-In Replacement For
- Direct replacement for OEM applications calling for FRS-R-15
- Compatible alternative to Cooper Bussmann and Eaton legacy part numbers
- Verify original part number and voltage/current ratings before installation
Works With
- Class R and RK5 rated fuse blocks (rejection feature prevents Class K use)
- Motor starter and disconnect switch combinations
- Standard circuit protection coordination schemes for industrial panels
- Equipment designed for 600VAC or 300VDC protection circuits
